Full Host Backup - What To Exclude?

Using Proxmox 3.

My overall goal is that I am going to use MondoRescue to generate a relatively full backup of the host, but not the running VMs. I want to be able to do a quick restore of the host then copy the vzdumped VMs back into play; I don't want to go the "just reinstall Proxmox, reinstall all the other stuff you may have crufted on, and then /etc..." route. I want it even easier than that.

I plan on excluding the following directories at a minimum:
/proc
/sys
/tmp
/var/tmp
/mnt

Any other I should exclude on a Proxmox host?